442 Hydraulic Schematic ms1422ledged-2

Posted in 442
HYDRAULIC/HYDROSTATIC SCHEMATIC
442 EXCAVATOR
(S/N 522311001 AND ABOVE)
(PRINTED APRIL 2005)
MS1422legend
PORT RELIEF VALVE - Boom Cyl.
(Rod End) 4350 PSI (300 Bar)
BACK-UP RELIEF VALVE
4350 PSI (300 Bar)
1
LOAD SENSE RELIEF VALVE
4060 PSI (280 Bar)
2
3
4
15
19
5
20
21
PRESSURE REDUCING VALVE
508 PSI (35 Bar)
22
ACCUMULATOR 145 PSI (10 Bar)
23
DUMP VALVE - PUMP 2
1595 PSI (110 Bar)
24
HYDRAULIC PISTON PUMP
Minimum Displacement
0.0 GPM (0.0 L/min) @ 2000 RPM
Maximum Displacement
37.5 GPM (142 L/min) @ 2000 RPM
25
Torque Limitor
26
PUMP MARGIN SPOOL
27
TORQUE LIMITER SUPPLY SPOOL
28
OIL TEMPERATURE REGULATOR
131 degrees F. (55 degrees C.)
LEGEND
PILOTED OPERATED TWO POSITION
VALVE
LOAD SENSE BLEED CARTRIDGE
6
7
8
9
10
11
12
13
Printed in U.S.A.
14
CHECK VALVE
29
OIL COOLER
30
HYDRAULIC PUMP # 1 Gear Type
8.7 GPM (33 L/min.) at 2000 Engine RPM
31
16
17
CROSS PORT RELIEF VALVE - 2 STAGE
1450 PSI (100 Bar) / 3625 PSI (250 Bar)
18
ANTI-CAVITATION VALVE
ORIFICE 0.06 inch (1,5 mm)
ORIFICE - One Way Restrictor
0.0023 inch (0,6 mm)
PORT RELIEF VALVE - Boom Cyl.
(Base End) 2610 PSI (180 Bar)
PORT RELIEF VALVE - Arm Cyl.
(Rod End) 4350 PSI (300 Bar)
PORT RELIEF VALVE - Arm Cyl.
(Base End) 4350 PSI (300 Bar)
PORT RELIEF VALVE - Bucket Cyl.
(Rod End) 4350 PSI (300 Bar)
PORT RELIEF VALVE - Bucket Cyl.
(Base End) 4350 PSI (300 Bar)
PORT RELIEF VALVE - Auxiliary
4350 PSI (300 Bar)
PORT RELIEF VALVE - Auxiliary
4350 PSI (300 Bar)
MAIN RELIEF VALVE (Gear Pump)
3335 PSI (230 Bar)
PORT RELIEF VALVE
5075 PSI (350 Bar)
ORIFICE
HYDRAULIC PUMP # 2 Gear Type
8.7 GPM (33 L/min.) at 2000 Engine RPM
365 PSI (25 Bar)
290 PSI (20 Bar)
NOTE: With clamp installed - Reset
port relief valve to 3625 PSI (250 Bar)
1 of 2
Dealer Copy -- Not for Resale
34
PRESSURIZED BREATHER / FILL CAP
5 PSI (0,34 Bar)
35
HYDRAULIC RESERVOIR - PRESSURIZED
Reservoir Volume 29 gal (110 L)
System Volume 37 gal (140 L)
36
COMPENSATOR - Standard
( Boom, Arm, Bucket, Auxiliary, Left Travel
and Right Travel)
37
CROSS PORT RELIEF VALVE -
Travel Motor 4060 PSI (280 Bar)
38
COUNTERBALANCE SPOOL (Travel
Motor)
39
TWO SPEED SHIFT SPOOL
40
MS1422legend (3-21-05)
NOTE: Unless otherwise specified
springs have NO significant
pressure value.
32
RETURN BLOCK With Check Valve
72.5 PSI (5 Bar)
33
MAIN FILTER
41
BRAKE CONTROL SPOOL
42
SELECTOR VALVE - MANUAL
(Bucket Cylinder or Secondary Auxiliaries)
SHUTTLE VALVE - DRIVE PRESSURE
43
CHECK VALVE - Accumulator
44
LOAD CHECK VALVE - Boom Swing
334 PSI (23 Bar)
45
ISO/STANDARD VALVE
46
CHECK VALVE
HYDRAULIC/HYDROSTATIC SCHEMATIC
442 EXCAVATOR
(S/N 522311001 AND ABOVE)
(PRINTED APRIL 2005)
MS1422legend
LEGEND
2 of 2
Dealer Copy -- Not for Resale